In how many years will a certain sum becomes five times itself at 20% per annum simple interest?

In how many years will a certain sum become 3 times itself at 25% per annum under simple interest? (a) 5 (b) 8 (c) 12 (d) 6

In how many years will a certain sum amounts to 6 times itself at 25% per annum simple interest ?

In how many years will a certain sum become 3 xx itself at 25% per annum under simple interest? 5 (b) 812 (d) 6

In what time will a sum become three times itself at 20% per annum, at simple interest?

In how many years will a sum of money become sixteen times itself at 30% p.a. simple interest?

In how many years will a sum of money double itself at 10 % per annum simple interest ?